Adjusting the Crystal Phase and Morphology of TiO2 via a Soft Chemical Process

论文发布时间：[2010-02-27] 范文大全编辑：Voive.net

所有作者：王靖宇韩喜江刘程蔡汝秀刘志洪

作者单位：哈尔滨工业大学化学系

论文摘要：The successful adjustment of phase composition and morphology of anatase/rutile TiO２ nanocomposites is achieved via a soft chemical strategy， which involves no templates， hydrothermal treatments or calcinations。 The process consists of a NaOH treatment of the hydrolysate of titanium tetra-n-butoxide and a subsequent acidic peptization of the H-titanate intermediate。 The effects of the acid peptization time， acid volume and the NaOH-treatment time on the properties of products are systematically investigated。 For the first time， the two-way phase transition between anatase and rutile is realized through adjusting the acid peptization time， which provides a promising way to control the phase ratio in preparing TiO２ anatase/rutile composites。 The mechanism of the phase transitions and crystal growth under such soft chemical processes is discussed in detail， and the evolution of the phase composition is illustrated according to dissolution-reassembly equilibrium。

关键词： TiO2 phase and morphology control soft chemical strategy

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